<div class="panel panel-default">
    <div class="panel-body">
        <ul style="list-style-type:none;margin: 0">
            <li style="list-style-type:none;width:50%;float: left;margin: 0">
                <div style="border:solid 1px red;height:30px;"></div>
            </li>
            <li style="list-style-type:none;width:50%;float: left;margin: 0">
                <div style="border:solid 1px red;height:30px;"></div>
            </li>
        </ul>
    </div>
</div>